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I've checked your forms It seems you added a background image to your form.
You can add background/cover image from designer.
Here is how to do this:
You can add image as you se below:
If you want to add image to form background of your form:
1) Click on Designer.
2) Click on Background Image choose Form Background option.
3) Choose am image from gallery or upload an image.
If you want to add image to form background of your page:
You need to choose Page background.
I hope this information is useful for you.
If you have any question or issues, please do not hesitate contacting us. We will be glad to assist you.